Honda H5518H Owner's Manual page 54

3. How to use the differential lock (A4 type only)
DIFFERENTIAL LOCK PEDAL
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When used properly, the differential lock is extremely conve-
nient. However, improper operation could cause the vehicle to overturn; it
could also damage the drive train. Take care when using the differential
lock.
The differential lock is most useful in situations where a slippery or loose
surface causes one of the rear wheels to lose traction.
Operation
1. Shift the main transmission lever into 4th or lower gear range.
2. With the steering wheel held straight-ahead, depress and hold the dif-
ferential lock pedal. As long as you continue to depress the pedal, the
differential lock will be applied.
3. The differential lock should release when the differential lock pedal is
released.
At times it may be necessary to stop, reverse direction, and drive a
short distance to disengage.
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